Greasing apparatus



Jan. 16, 1934. M N 1,943,605

GREASING APPARATUS Filed Nov. 23, 1931 3 Sheets-Sheet 1 li w bray:

Filed Nov. 23, 1931 3 Sheets-Sheet 2 Em 5 Ha \w an 50 um I fw. 6 00 (I 5l I. Q zw fl 4 Z w m a Mil ll 4 FM r N 6 w w wan/w 0 Mi M Jan. 16, 1934.G. H. HARTMAN enmsme APPARATUS Filed Nov. 23, 1931 3 Sheets-Sheet 3Patented Jan. 16, 1934 UITE ST TES GREASING APPARATUS George H. Hartman,Bryan, Ohio, assignor to The Arc Equipment Corporation, Bryan. Ohio, a

corporation of Ohio Application November 23, 1931 Serial No. 578,689

lzclaims.

An object of my present invention is to provide a. greasing apparatus orlubricant dispensing device of portable character which may be operatedby an electric motor or other power means and which is comparativelysimple in proportion to the results obtained.

A further object is to provide a pump structure in which flrst, secondand third stage pumps are provided with an automatic means for renderingthe second stage pump ineflective and the third stage pump eflective,such means being operated by the pressure of the lubricant beingdispensed.

Still a further object is to provide a greasing apparatus or lubricantdispensing structure in which two pumps are provided, one for pumping alarge volume of lubricant at low pressure and the other for pumping asmall volume of lubricant at high pressure, both pumps beingcontinuously operated from ,the same source of power, but only one ofthem being eiiective at a time.

A further object is to provide means for normally allowing lubricantpumped by the low pressure pump to pass through the high pressure pumpwithout the high pressure pump imparting a high pressure to suchlubricant, but the high pressure pump being eflective and the lowpressure pump fittings and will normally quickly lubricate them underlow pressure, but will more slowly lubricate them under high pressure ifresistance to the' flow of grease into the fitting is encountered.

Still a further object is to utilm the built up pressure caused by suchresistance for automatically rendering the low pressure pumpineiiective' so that the high pressure pump can then operate, thisoperation being entirely automatic so that it does not require any ofthe user's attention.

A further object is to provide a pair of pumps, one being of highpressure type comprising a cylinder and a plunger, the plunger during aportion of its'reciprocation being removed from the cylinder whereby theother pump may pump a large volume of lubricant through the cylinderduring the period of time that the plunger traverses such portion oi itsreciprocation.

Another object is to pro ide a modifled'form of construction in whichthe pump that is rendered ineiiective may be adjusted to an operativeposition manually so that the pump can operate continuously but will beeiiective' as a pump only when so manually adjusted.

With these and other objects in view my invention consist in theconstruction, arrangement and combination of the various parts of mydevice, whereby the objects contemplated are attained, as hereinaftermore fully set forth, pointed out in my claims, and illustrated in theaccompanying drawings, in which:

Figure 1 is a plan view of a portable greasing apparatus or lubricantdispensing device embodying my invention.

Figure 2 is a side elevation of the same, parts thereof being brokenaway and other parts shown in section.

Figure 3 is a vertical, enlarged, sectional view on the line 3-3 ofFigure 2.

Figure 4 is a sectional view on the line 44 of Figure 3.

Figure 5 is a sectional view similar to the top portion of Figure 3showing the modifled construction.

Figure 8 is an enlarged, sectional view on the line 88 0! Figure 2showing the third stage pump.

Figure 7 is a sectional view on-the line 7--'1 of Figure 3 showing thefirst stage pump; and

Figure 8 is a sectional view on the line 8-8 of Figure 3 showing thesecond stage pump.

on the accompanying drawings I have used the reference numeral 10 toindicate an original container for grease or other lubricant. Thecontainer 10 has an opening 12 in the top thereoi through which theintake tube 14 of my lubricant dispensing device may be inserted.

The intake tube 14 is supported by a flange 16 resting on top of thecontainer 10. A hub member 18 is secured to the lower end of the intaketube 14 and a second stage pump housing 20 in turn is secured to the hub18 as by bolts 22. A worm gear housing 24 is secured to the flange 18 asby bolts 26. A tubular drive shaft 28 is journaled in bores 30 and 32 ofthe hub 18 and the housing 24 respectively.

A flrst stage pump member A is keyed to the lower end of the drive shaft28 and includes upper and lower flanges 34 and 38. The flange 34 isprovided with a pair of outlet openings 38, while a pair of spirallyarranged wall members connect the flanges 34 and 36 together. The walls40 are arranged as shown in Figure 7 so that they provide inlet openings42 into which the lubricant is forced as indicated by the arrows a whenthe pump member A rotates in the direction of thearrow b. o

The flange 36 in the intake ends 42 is relatively low compared to theopposite ends 44 as perhaps best shown in Figure 3, partly by dottedlines. It is therefore obvious that rotation of the pump member A in thedirection of the arrow b will cause lubricant from the container 10 tobe elevated from the intake ends 42 to the opposite ends 44. .1

The outlet openings 38 of the, 84 communicate with an inlet ope432'6fthe second stage pump-housing 20 (see 3 and a). A

second stage pump rotor 48 is keyed to the tubular shaft 28 and isprovided with lobes 50 contacting with the interior shaft of the housing20. Different rotors 48 may be substituted for the one shown having moreor less marked lobes 50 for pumping greater or less quantities oflubricant by the rotor 48.

A wiper 52 is slidably mounted in a square socket 54 of the housing 20to wipe lubricant from the lobes 50 as the rotor 48 rotates in thedirection of the arrow b and causes flow of such lubricant into adischarge passageway 56. The wiper 52 is normally and resilientlyretained in contact with the rotor 48 by a spring 58.

The discharge passageway 56 extends up through a web 60 of the hub 18(see Figure 3) and discharges into the intake tube 14. The lubricant isthen forced up through the tube 14 by the second stage pump rotor 48 andinto a cavity 62 of the worm gear housing 24.

The cavity 62 communicates with a cavity 64 (see Figure 2) with a checkvalve 66 interposed between the two cavities. The check valve 66 ismounted in a valve cage 68 and is spring pressed to close against thecavity 62 by a spring 70.

The cavity 64 communicates with a cavity '12 in a third stage pumphousing 74. Within the housing 74, I provide a third stage pump assembly13 consisting .of a guide member75, a valve cage 76, a closure nut 78and other associated parts, which will now be described. All are mountedin a bore 80.

The guide member '75 is seated against a gasket 82 and against ashoulder 84. The cage 76 is screwed into a threaded portion 86 of thebore and bears against a cylinder member 88 which is mounted in theguide member 75 and causes the guide member to seat against the shoulder84 and against the gasket 82, the gasket being slightly compressible sothat both joints can be rendered tight.

Within the valve cage 76.1 provide a primary check valve 90 seatedagainst the cylinder member 88 and a secondary check valve 92 seatedagainst a seat 94. From the cylinder member 88, lubricant can be forcedpast the check valves 90 and 92 and through the passageway 96 into acavity 98. The closure nut 78 retains the valve cage 76 in position andcompletely encloses it.

The tubular shaft 28 is rotated from a motor 100 which is provided witha worm 102 meshed with a worm gear 104. The worm gear 104 is keyed tothe tubular shaft as shown in Figure 3. The shaft of the motor 100extends into the third stage pump housing 74 as indicated at 108, and isprovided with an offset or eccentrically mounted crank pin 108. A rolleris mounted on the crank pin 108' for contact with a plunger 112 guidedin the guide member 75 and adapted to enter the cylinder 114 of thecylinder member 88 during a portion of the reciprocation of the plunger,The plunger 112 is held in engagement with the roller 110 by a springllfi engaglng a flange 118 of the plunger. A sleeve member 120 enclosesthe spring 116.

The cavity 98 into which the lubricant is forced after passing the checkvalves 90 and 92 communicates by a passageway 122 with a tube 124. Thetube 124 extends to-a header 126 which in turn communicates withaftubular'dlspenslng hose 70 ,and 2).

ball 132 normally seated by a follower pin 134 and a spring 136. Thetension of the spring 136 is adjustable by rotating an adjusting sleeve138. A lock nut 140 is provided for the adjusting sleeve 138. A closurenut 142 normally encloses the valve C but may be removed for adjustingthe sleeve 138.

Referring to Figure 3 it will be noted that I have provided a backingblock 144 for the spring 58. A bell crank lever 146 is pivoted on abracket 148 and has a roller 150 engaged with a control rod 152. Thecontrol rod 152 extends through the tubular drive shaft 28 and into acavity 154 of a hub 156. The hub 156 is formed on a cover plate 158 forthe worm gear housing 24.

A cylinder member 160 is screwed into the upper end of the hub 156* andhas a cylinder bore 162 to receive a piston 164 of the control rod 152.The rod 152 and the piston 164 are packed relative to the hub 156 bypackings 166 and 168 respectively. These packings are retained tight bysprings as clearly shown.

The control rod 152 is normally retained in the position of Figure 3 bya spring 170 of sufficient i tension to normally aid the spring 58 inkeeping the wiper-52 against the pump rotor 48 and the tension of thespring 170 may be adjusted by an adjusting screw 172.

The cavity 154 is hydraulically connected with j the header 126 by apipe 1'74. This serves to introduce the pressure built up in the hose128 into the cavity 154 for acting on the piston 164 as will hereinafterbe described.

In- Figure 4 I have shown how the pipe 174 3 is connected with the hub156 and sealed relative thereto. It will be noted that the pipe has ashoulder 1'76 seating against a seat 178 of the hub 156. The shoulderand seat are retained in tight engagement with each other by a cap screw180. The cap screw 180 seats against a seat- 182 of the'hub 156 andscrews into the pipe 1'14 wherebytightening of the cap screw draws theshoulders 1'76 and 178 together, as well as drawing the head of the capscrew 180 against the seat 182. 1

teristica. The control rod 1520. in 'this inl stance is retained inraised position by a spring 186. The control rod may be lowered manuallyby a lever 188 which 'is pivoted by a link 190 to an ear 192 on theclosure plate 158a. The purpose and use of this modification will beherein- 1 after described.

Practical operation Having fully described the details of constructionof my portable greasing apparatus or lubri- 1 eating device, I will nowdescribe the operation thereof:

with the pump motor 100 in operation, the first stage pump A and thepump rotor 48 will be continuously rotated and likewise the crank pin 1108 will be continuously rotated for imparting reciprocation 'totheplunger 112. with the nozzle portion 1310! the discharge nozzle 130connected with a lubricant receiving fitting, the

valveof the nozzle may be opened by depressing 1.

11 the fitting will receive lubricant freely the normal operation of them is as follows:-

The rotating first stage pump A picks up lubricant from the container 10and discharges it through the eway 46 into the housing 20.

The pump rotor 48, in conjunction with the wiper 52, pumps a largevolume 01' lubricant at low pressure up through the eway 56, intake tube14 and check valve 68 to the cavities 64 and 72. From the cavity 72 thelubricant passes through openings '13 and 71 and then through thecylinder 114 while the plunger 112 is in the medpositionoil 'igurefl.Thislargevolume of lubricant opens the check valves and 82 and fiowsthrough them and the w: eway 96 into the cavity 98, from which it fiowsthrough the passageway 122 and pipe 124 and on to thehose128sothatitcanbesuppliedtothedischarge nozzle 130.

The foregoing normal operation permits of quick filling of the bearingon which the lubricant receiving fitting is mounted, but ii it sohappens that great resistance is encountered. becauseoi'thebearingbeingcloggedortoranyotherreason,thepressureinthehosewillbebuilt up and will likewise be built upin the cavity 154 (seel'igureii). Thiscausesthepiston 184tobe raisedagainst the action 01 the spring 170, therebythetensionotthespring58sothat the wiper 52 is ineil'ective and consequently renders the secondstage pump inefiectivc even thoughtherotorsscontinuestorotate. '1herotor48 and the first stage pump, however, continue to supply lubricant,through the intake pipe 14. to the space around the plunger 112 withplenty 01 chance for slippage oi the first and second stage pumpsrelative to the lubricant, because of their attempting to suDPLY morelubricant than canbehandledbythethirdstagepump.

Practically the entire power of the motorwillnowbeutilizedinoperatingthehighpressure third stage pump plunger 112for supplying the lubricant under much higher pressure than possible bythe second stage pump rotor 48. Thiswillbeevidentbecauseotthepressureinthehose128beingbuiltuptosuchanextentthat the second stage pump is renderedineil'ective by the control rod 152 as just described, and the plunger112 will force a small quantity of lubri cantathighpressure intothehose128eachtime the plunger reciprocates into the cylinder 114.Assoonasthehigh pressureconditionisrelieved, the spring 170 will forcethe control rod 152 downwardly so that the second stage pump is againand automatically rendered effective and accomplishes the dispensingoperation thereafter until high resistance is again encountered. Thus itwill be obvious that large quantity, low pressure dispensation normallyoccurs, but small quantity. high premure dispensation is automaticallyefiected whenever called for because of conditions en-.

countered.

'lhe check valve 66 serves to trap a quantity of lubricant in thecavities 84 and 72 which is supplied'to the thirdstage pumpBwhenpressurebuiltupinthehose128andthecavityl54raisesthepistonlfiiorthetensionoi' thespring58andthusrenderlngthesecondstage pump inefiective. 'l'he by-pass valve 132is'providedforanemergencyinwhichthebearingisirosenandthethirdstagepumphasatendacytobuildupapressureinthehoselawhichwouldeventualiyburstthehoseorcause other damage. It will be obviousthat before such an excessively high Pressure is reached, the valve182willopenagainstthetensionotthespring 138 so that a reciprocation orthe plunger 112 way 181.

Although I have illustrated first, second and third stage pumps. thesecond and third stage oniycanbeused,orthefirstandsecond can be used fora dlspenser which disonly a large quantity oi lubricant at low Again,the second stage pump only used. In the event that the first and 152amay still be utilized. It where the motor 100 operates com the secondstage pump is norineii'ective, by the spring 185 raising the 152, butcan be rendered manually efiective Changes as shown in the modificationand others as well, can be made without departing from the real spiritand purpose of my invention. and it is my intention to cover by myclaims, any modified torms of structure or use 01' mechanicalequivalents, which may be reasonably included within their scope.

I claim as my invention:-

1. A lubricant structurecomprisingfirst,secondandthirdstagepumps,adischarge nodule, means fornormally causing dispensation o! a large volume ot'lubricanttherethrough at low pressure by sa d second stage pump. said third stagepump being operative to pump a small volume or lubricant through saiddischarge nozzle at high pressure upon the lubricant a predeterminedresistance during dispensation from said discharge nozzleandmeansoperatedbytheincreasedpressureof the lubricant in said nozzlefor rendering said second stage pump inefiective as a pump and operableonly as a movable'element in thelubricantfiowingiromsaidfirststagepumptosaid third stage pump upon suchoperation of said third stage pump.

lAlubrlcantd structurecomprisingfirst. second and third stage pump isecond stagepumpcomprisingarotorandamovable wiper, a discharge noasle,means for normally causing dispensation of a large volume of lubricanttherethrough at low pressure by said second stage pump, said'third stagepump being automatically operative to pump a small volume of lubricantthrough said discharge music at high pressure upon the lubricantencountering a predetermined resistance durlng dispensation fromsaiddischargenouieandmeansoperatedbythe increased pressure of thelubricant in said nozzle for moving said wiper to an ineiiectlveposition uponsuchoperationoi'saidthirdstagepump.

8. In a lubricant structure, a disdischarging lubricant therefrom, meansfor continuously and simultaneously operating said pumps, said secondstage pump including a rotor and a spring urged wiper blade coactingwith the periphery thereof and manually operable means for moving saidwiper blade to non-wiping position to thereby render said second stagepump inoperative to pump lubricant when desired 5. In a lubricantdispensing structure, a discharge nozzle, first and second stage pumpsfor discharging lubricant therefrom, means for continuously andsimultaneously operating said pumps, said second stage pump including arotor and a wiper blade coacting with the periphery thereof and means tomove said wiper blade to a non-wiping position to render said secondstage pump inoperative to pump lubricant, said means being automaticallycontrolled dependent upon the pressure of the lubricant being dispensed.

6. In a lubricant dispensing structure, a dis charge nozzle, a primaryand a secondary pump for dispensing large and small volumes of lubricanttherethrough at low and high pressures respectivelv, said primary pumpbeing normally operable to pump lubricant without said secondarypump'imparting high pressure thereto, said secondary pump including arotor and a wiper blade coacting with the periphery thereoi and pressureoperated means responsive to in said discharge nozzle to move said wiperblade to non-wiping position and thereby render said primary pumpinoperative to pump any lubricant and said secondary pump operative topump lubricant at high pressure.

7. In a lubricant dispensing structure, a discharge nozzle, first andsecond stage pumps for discharging lubricant therefrom, said secondstage pump being of rotary type, power means for continuously operatingmovable elements of said pumps and means to move one of the movableelements of said second stage pump to inoperative position to therebyrender the pump inoperative to pump any lubricant and thereby eliminatethe need of any power being expended to overcome inertia or momentum oflubricant when the second stage pump is rendered inoperative even thoughone oi the movable elements thereof is still being operated by saidpower means, said means being responsive to pressure in said dischargenozzle.

8. A lubricant dispensing structure comprising primary and secondarypumps, D wer means to simultaneously operate said pumps, said secondarypump being of reciprocating type including a cylinder and a plunger,said plunger, during a portion of its reciprocating movement aI owingnow of lubricant from the space around said plunger into said cylinder,said primary pump normally pumping lubricant into said cylinder duringthe time when the plunger traverses such portion of its reciprocatingmovement, movable means to render said primary pump ineiiective as apump and said pump effective to discharge lubricant from said dischargenozzle under volume of lubricant through said discharge nozzle at highpressure upon the lubricant encountering a predetermined resistanceduring dispensation from said discharge nozzle and means for renderingsaid second stage pump ineffective as a pump and operable only as amovable element in the lubricant flowing from said first stage pump tosaid third stage pump upon such operation of said third stage pump.

10. In a greasing apparatus, a large volume low pressure pump, anintermediate volume intermediate pressure pump and a small volume highpressure pump, said pumps being hydraulically connected in series, anozzle at the discharge end of the third pump, said third pump includinga cylinder and a plunger, said plunger in one position permitting thesecond pump to pump grease past the plunger and into and through thecylinder and means to permit the first pump to pump grease through thesecond pump directly to the third pump and the third pump only to pumpsaid grease from said nomle at low volume high pres- 11. In a greasingapparatus, a large volume low pressure pump, an intermediate volumeintermediate pressure pump and a small volume high pressure pump, saidpumps being hydraulically connected in series, a nozzle at the dischargeend of the third pump, said third pump including a cylinder and aplunger, said plunger in one position permitting the second pump to pumpgrease past the plunger and into and through the cylinder and meansresponsive to pressure in said nozzle to permit the first pump to pumpgrease through the second pump directly to the third pump and the thirdpump only to pump said grease from said nomle at low volume highpressure.

12. In a apparatus, a large volume low pressure pump, an intermediatevolume intermediate presure pump including a rotor and a wiper and asmall volume high pressure pump, said pumps being hydraulicallyconnected in series, a nozzle at the discharge end of the third pump,said third pump including a cylinder and a plimger, said plunger in oneposition permitting the second pump to pump grease past the plunger andinto and through the cylinder and means to render said wiper ineffectiveand thereby to permit the first pump to pump grease through the secondpump directly to the third pump and the third pump only to pump saidgrease from said nozzle at low volume high pressure.

GEORGE H. HAR'IMAN.

